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Title: Nonlinear polariton parametric emission in an atomically thin semiconductor based microcavity
Authors: Zhao, Jiaxin
Fieramosca, Antonio
Bao, Ruiqi
Du, Wei
Dini, Kevin
Su, Rui
Feng, Jiangang
Luo, Yuan
Sanvitto, Daniele
Liew, Timothy Chi Hin
Xiong, Qihua
Keywords: Science::Physics::Optics and light
Issue Date: 2022
Source: Zhao, J., Fieramosca, A., Bao, R., Du, W., Dini, K., Su, R., Feng, J., Luo, Y., Sanvitto, D., Liew, T. C. H. & Xiong, Q. (2022). Nonlinear polariton parametric emission in an atomically thin semiconductor based microcavity. Nature Nanotechnology.
Project: MOE2018-T3-1-002
Journal: Nature Nanotechnology
Abstract: Parametric nonlinear optical processes are at the heart of nonlinear optics underpinning the central role in the generation of entangled photons as well as the realization of coherent optical sources. Exciton-polaritons are capable to sustain parametric scattering at extremely low threshold, offering a readily accessible platform to study bosonic fluids. Recently, two-dimensional transition-metal dichalcogenides (TMDs) have attracted great attention in strong light–matter interactions due to robust excitonic transitions and unique spin-valley degrees of freedom. However, further progress is hindered by the lack of realizations of strong nonlinear effects in TMD polaritons. Here, we demonstrate a realization of nonlinear optical parametric polaritons in a WS2 monolayer microcavity pumped at the inflection point and triggered in the ground state. We observed the formation of a phase-matched idler state and nonlinear amplification that preserves the valley population and survives up to room temperature. Our results open a new door towards the realization of the future for all-optical valley polariton nonlinear devices.
ISSN: 1748-3387
DOI: 10.1038/s41565-022-01073-9
Schools: School of Physical and Mathematical Sciences 
Rights: © 2022 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved. This paper was published in Nature Nanotechnology and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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